package org.yang.reggie.filter;

import com.alibaba.fastjson.JSON;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;
import org.yang.reggie.common.BaseContext;
import org.yang.reggie.common.R;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.rmi.server.RMIClassLoader;

/**
 * @author 缘友一世
 * date 2023/5/9-11:43
 */
@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    //路径匹配器
    public static final AntPathMatcher PATH_MATCHER=new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request=(HttpServletRequest) servletRequest;
        HttpServletResponse response=(HttpServletResponse) servletResponse;
        // filterChain.doFilter(request,response);
        //1、获取本次请求的URI
        String requestURI = request.getRequestURI();
        log.info("拦截到请求:{}",requestURI);

        //2、判断本次请求是否需要处理
            //无需处理的请求路径
        String[] urls = {
                "/employee/login",  //登录
                "/employee/logout", //退出登录
                "/backend/**",      //后端静态资源
                "/front/**",        //移动端静态资源
                "/common/**",       //后端通用资源
                "/user/sendMsg",    //移动端发送短信
                "/user/login",       //, 移动端登录
                "/doc.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs"
                //"/dish/list/**",     //移动端查询菜品
                //"/setmeal/list/**"   //移动端查询套餐
        };
        //3、如果不需要处理，则直接放行
        boolean res = check(requestURI, urls);
        if(res) {
            log.info("本次请求{}无需处理",requestURI);
            filterChain.doFilter(request,response);
            return ;
        }
        //4、判断登录状态，如果已登录，则直接放行
        Object employee = request.getSession().getAttribute("employee");
        if(employee!=null) {
            log.info("用户已登录:用户ID为{}",request.getSession().getAttribute("employee"));

            BaseContext.setCurrentId((Long) request.getSession().getAttribute("employee"));
            // long id = Thread.currentThread().getId();
            // log.info("线程id为：{}",id);

            filterChain.doFilter(request,response);
            return;
        }
        //5、如果未登录则返回未登录结果,通过输出流的方式向客户端响应数据
        log.info("用户未登录");
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    /**
     * 路径匹配，检查本次请求是否放行
     * @param requestURI
     * @param urls
     * @return
     */
    public boolean check(String requestURI,String[] urls) {
        for (String url : urls) {
            boolean res = PATH_MATCHER.match(url, requestURI);
            if(res) {
                return true;
            }
        }
        return false;
    }
}
